/*
 * Copyright (C) 2014, Arthur Daussy <arthur.daussy@obeo.fr>
 * Copyright (C) 2015, Christian Halstrick <christian.halstrick@sap.com>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.eclipse.jgit.internal.storage.file;

import java.io.File;
import java.io.IOException;

import org.eclipse.jgit.attributes.AttributesNode;
import org.eclipse.jgit.lib.CoreConfig;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.util.FS;

/**
 * Attribute node loaded from global system-wide file.
 */
public class GlobalAttributesNode extends AttributesNode {
	final Repository repository;

	/**
	 * Constructor for GlobalAttributesNode.
	 *
	 * @param repository
	 *            the {@link org.eclipse.jgit.lib.Repository}.
	 */
	public GlobalAttributesNode(Repository repository) {
		this.repository = repository;
	}

	/**
	 * Load the attributes node
	 *
	 * @return the attributes node
	 * @throws java.io.IOException
	 */
	public AttributesNode load() throws IOException {
		AttributesNode r = new AttributesNode();

		FS fs = repository.getFS();
		String path = repository.getConfig().get(CoreConfig.KEY)
				.getAttributesFile();
		if (path != null) {
			File attributesFile;
			if (path.startsWith("~/")) { //$NON-NLS-1$
				attributesFile = fs.resolve(fs.userHome(),
						path.substring(2));
			} else {
				attributesFile = fs.resolve(null, path);
			}
			FileRepository.AttributesNodeProviderImpl.loadRulesFromFile(r, attributesFile);
		}
		return r.getRules().isEmpty() ? null : r;
	}
}